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Snapshot-at-the-beginning solutions: Wilson calls solutions that address D2/T2 mutations snapshot-at-the-beginning techniques since they preserve the set of objects that were live at the start of the collection. They inform the collector when the mutator deletes a white pointer from a grey or white object (ahead of the wavefront). Snapshot-at-the-beginning solutions conservatively treat an object as live (non-white) if a pointer to it ever existed ahead of the wavefront, speculating that the mutator may have also inserted that mutator behind the wavefront.

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Snapshot-at-the-beginning solutions: Wilson calls solutions that address D2/T2 mutations snapshot-at-the-beginning techniques since they preserve the set of objects that were live at the start of the collection. They inform the collector when the mutator deletes a white pointer from a grey or white object (ahead of the wavefront). Snapshot-at-the-beginning solutions conservatively treat an object as live (non-white) if a pointer to it ever existed ahead of the wavefront, speculating that the mutator may have also inserted that mutator behind the wavefront.
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Hayley (hayley@social.applied-langua.ge)'s status on Tuesday, 12-Dec-2023 15:47:18 JST Hayley
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just checked with a book written by snooty compsci academics, snapshot at the beginning preserves objects that were live if you took a snapshot at the beginning

("D2/T2 mutations" refers to some examples of breaking concurrent GC earlier in the chapter, it makes sense in context)

In conversation about a year ago from social.applied-langua.ge permalink